linux-kernel - [PATCH 1/2] dt-bindings: drm/bridge: ti-sn65dsi86: Replace #pwm-cells

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Date:   Wed, 30 Sep 2020 17:35:31 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Douglas Anderson <dianders@...omium.org>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: drm/bridge: ti-sn65dsi86: Replace #pwm-cells

While the signal on GPIO4 to drive the backlight controller indeed is
pulse width modulated its purpose is specifically to control the
brightness of a backlight.

Drop the #pwm-cells and instead expose a new property to configure the
granularity of the backlight PWM signal.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 .../devicetree/bindings/display/bridge/ti,sn65dsi86.yaml | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
index f8622bd0f61e..e380218b4646 100644
--- a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
@@ -66,9 +66,12 @@ properties:
       1-based to match the datasheet.  See ../../gpio/gpio.txt for more
       information.
 
-  '#pwm-cells':
-    const: 1
-    description: See ../../pwm/pwm.yaml for description of the cell formats.
+  ti,backlight-scale:
+    description:
+      The granularity of brightness for the PWM signal provided on GPIO4, if
+      this property is specified.
+    minimum: 0
+    maximum: 65535
 
   ports:
     type: object
-- 
2.28.0